:root {
    --bg: #F4F1E9;
    --bg-2: #ECE7DB;
    --ink: #14110F;
    --ink-2: #4A4540;
    --ink-3: #8A8278;
    --rule: #D8D1C2;
    --rule-soft: #E5DFD2;
    --accent: oklch(0.58 0.14 52);
    --accent-soft: oklch(0.58 0.14 52 / 0.10);
    --live: oklch(0.55 0.13 145);
    --wip: oklch(0.65 0.12 80);
    --lab: oklch(0.55 0.13 270);

    --serif: "DM Sans", -apple-system, "Helvetica Neue", sans-serif;
    --sans: "DM Sans", -apple-system, "Helvetica Neue", Arial, sans-serif;
    --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  }

  * { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; }
  body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    font-weight: 400;
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  a { color: inherit; text-decoration: none; }

  ::selection { background: var(--ink); color: var(--bg); }

  .container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 32px;
  }

  /* ───────── header ───────── */
  header.site {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--bg) 90%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--rule-soft);
  }
  header.site .row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
  }
  .brand {
    display: flex;
    align-items: baseline;
    gap: 10px;
    font-family: var(--serif);
    font-weight: 500;
    font-size: 24px;
    letter-spacing: -0.025em;
    line-height: 1;
  }
  .brand .dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    display: inline-block;
    transform: translateY(-2px);
  }
  .brand small {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink-3);
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }
  nav.primary {
    display: flex;
    align-items: center;
    gap: 28px;
    font-size: 14px;
    color: var(--ink-2);
  }
  nav.primary a {
    transition: color 0.15s;
  }
  nav.primary a:hover { color: var(--ink); }

  .lang {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--rule);
    border-radius: 999px;
    padding: 3px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    background: color-mix(in srgb, var(--bg-2) 60%, transparent);
  }
  .lang button {
    appearance: none;
    border: 0;
    background: transparent;
    padding: 5px 10px;
    border-radius: 999px;
    cursor: pointer;
    color: var(--ink-3);
    font: inherit;
    text-transform: uppercase;
    transition: all 0.18s ease;
  }
  .lang button.is-active {
    background: var(--ink);
    color: var(--bg);
  }

  /* ───────── hero ───────── */
  .hero {
    padding: 80px 0 72px;
    border-bottom: 1px solid var(--rule-soft);
    position: relative;
    overflow: hidden;
  }
  .hero .eyebrow {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-3);
    margin-bottom: 28px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
  }
  .hero .eyebrow .pulse {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--live);
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--live) 60%, transparent);
    animation: pulse 2.4s infinite;
  }
  @keyframes pulse {
    0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--live) 60%, transparent); }
    70% { box-shadow: 0 0 0 10px color-mix(in srgb, var(--live) 0%, transparent); }
    100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--live) 0%, transparent); }
  }
  .hero h1 {
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(40px, 5.6vw, 80px);
    line-height: 1.02;
    letter-spacing: -0.035em;
    margin: 0 0 28px;
    max-width: 16ch;
  }
  .hero h1 em {
    font-style: normal;
    color: var(--accent);
  }
  .hero .lede {
    max-width: 56ch;
    font-size: 17px;
    line-height: 1.55;
    color: var(--ink-2);
  }

  .hero .meta-row {
    margin-top: 56px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    padding-top: 32px;
    border-top: 1px solid var(--rule);
  }
  .meta-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }
  .meta-row .meta-item:nth-child(2) { align-items: center; text-align: center; }
  .meta-row .meta-item:nth-child(3) { align-items: flex-end; text-align: right; }
  .meta-item .k {
    font-family: var(--mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-3);
  }
  .meta-item .v {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 20px;
    letter-spacing: -0.02em;
    line-height: 1.1;
  }

  /* ───────── section heads ───────── */
  section.block {
    padding: 96px 0;
    border-bottom: 1px solid var(--rule-soft);
  }
  .section-head {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 48px;
    align-items: baseline;
    margin-bottom: 56px;
  }
  .section-head .tag {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-3);
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .section-head .tag::before {
    content: "";
    width: 32px;
    height: 1px;
    background: var(--ink);
  }
  .section-head h2 {
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(30px, 3.6vw, 44px);
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin: 0;
    max-width: 22ch;
  }
  .section-head h2 em {
    font-style: normal;
    color: var(--accent);
  }

  /* ───────── projects ───────── */
  .projects {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid var(--rule);
    border-radius: 4px;
    overflow: hidden;
    background: var(--bg-2);
  }
  .project {
    background: var(--bg);
    padding: 36px 36px 32px;
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 380px;
    transition: background 0.2s;
  }
  .project + .project { border-left: 1px solid var(--rule); }
  .project:hover { background: color-mix(in srgb, var(--bg) 70%, var(--bg-2)); }

  .project .head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 28px;
  }
  .project .name {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 36px;
    line-height: 1;
    letter-spacing: -0.035em;
  }
  .project .name sup {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--ink-3);
    letter-spacing: 0.06em;
    vertical-align: top;
    margin-left: 4px;
    font-weight: 400;
  }

  .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-2);
    padding: 6px 10px 6px 8px;
    border: 1px solid var(--rule);
    border-radius: 999px;
    background: var(--bg);
    white-space: nowrap;
  }
  .badge .swatch {
    width: 6px; height: 6px; border-radius: 50%;
  }
  .badge.live .swatch { background: var(--live); box-shadow: 0 0 0 3px color-mix(in srgb, var(--live) 18%, transparent); }
  .badge.wip .swatch  { background: var(--wip);  box-shadow: 0 0 0 3px color-mix(in srgb, var(--wip) 18%, transparent); }
  .badge.lab .swatch  { background: var(--lab);  box-shadow: 0 0 0 3px color-mix(in srgb, var(--lab) 18%, transparent); }

  .project .category {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink-3);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 14px;
  }
  .project .desc {
    color: var(--ink-2);
    font-size: 16px;
    line-height: 1.5;
    margin-bottom: 28px;
    max-width: 42ch;
  }

  /* visual placeholder per project */
  .preview {
    margin-top: auto;
    aspect-ratio: 16 / 7;
    border: 1px solid var(--rule);
    border-radius: 4px;
    background:
      repeating-linear-gradient(
        135deg,
        transparent 0 11px,
        color-mix(in srgb, var(--ink) 4%, transparent) 11px 12px
      ),
      var(--bg-2);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 18px;
    font-family: var(--mono);
    font-size: 10px;
    color: var(--ink-3);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    overflow: hidden;
    position: relative;
  }
  .preview .corner {
    position: absolute;
    width: 10px; height: 10px;
    border: 1px solid var(--ink-3);
  }
  .preview .corner.tl { top: 6px; left: 6px; border-right: 0; border-bottom: 0; }
  .preview .corner.tr { top: 6px; right: 6px; border-left: 0; border-bottom: 0; }
  .preview .corner.bl { bottom: 6px; left: 6px; border-right: 0; border-top: 0; }
  .preview .corner.br { bottom: 6px; right: 6px; border-left: 0; border-top: 0; }
  .preview .label { z-index: 2; }

  .project .actions {
    display: flex;
    gap: 10px;
    margin-top: 22px;
    align-items: center;
  }
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 11px 16px;
    border-radius: 999px;
    border: 1px solid var(--ink);
    background: var(--ink);
    color: var(--bg);
    font-family: var(--sans);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.18s ease;
    text-decoration: none;
  }
  .btn:hover { background: var(--bg); color: var(--ink); }
  .btn.ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--rule);
  }
  .btn.ghost:hover {
    border-color: var(--ink);
  }
  .btn .arrow {
    font-family: var(--mono);
    transition: transform 0.18s ease;
  }
  .btn:hover .arrow { transform: translateX(2px); }

  /* ───────── lab ───────── */
  .lab {
    background: var(--bg-2);
    border-bottom: 1px solid var(--rule-soft);
  }
  .lab .section-head .tag::before { background: var(--lab); }
  .lab-card {
    background: var(--bg);
    border: 1px solid var(--rule);
    border-radius: 4px;
    padding: 40px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }
  .lab-card .left {
    display: flex;
    flex-direction: column;
    gap: 18px;
  }
  .lab-card .name {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 52px;
    line-height: 0.98;
    letter-spacing: -0.035em;
  }
  .lab-card .name .accent { color: var(--accent); font-style: normal; }
  .lab-card .category {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--ink-3);
    text-transform: uppercase;
  }
  .lab-card .desc {
    font-size: 16px;
    line-height: 1.5;
    color: var(--ink-2);
    max-width: 40ch;
  }

  /* schematic */
  .schematic {
    aspect-ratio: 5/3;
    border: 1px solid var(--rule);
    border-radius: 4px;
    position: relative;
    background:
      linear-gradient(var(--rule-soft), var(--rule-soft)) 0 50% / 100% 1px no-repeat,
      linear-gradient(var(--rule-soft), var(--rule-soft)) 50% 0 / 1px 100% no-repeat,
      var(--bg-2);
    overflow: hidden;
  }
  .schematic .node {
    position: absolute;
    width: 56px; height: 56px;
    border: 1px solid var(--ink);
    border-radius: 50%;
    background: var(--bg);
    display: flex; align-items: center; justify-content: center;
    font-family: var(--mono); font-size: 10px;
    color: var(--ink-2);
    letter-spacing: 0.04em;
  }
  .schematic .node.a { top: 20%; left: 14%; }
  .schematic .node.b { top: 60%; left: 38%; background: var(--ink); color: var(--bg); border-color: var(--ink); }
  .schematic .node.c { top: 24%; right: 14%; }
  .schematic .node.d { bottom: 14%; right: 22%; }
  .schematic svg.lines { position: absolute; inset: 0; width: 100%; height: 100%; }

  /* ───────── about / contact ───────── */
  .about {
    padding: 120px 0;
  }
  .about .grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 80px;
    align-items: start;
  }
  .about p {
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(22px, 2.1vw, 28px);
    line-height: 1.32;
    letter-spacing: -0.025em;
    color: var(--ink);
    margin: 0 0 24px;
  }
  .about p em {
    color: var(--accent);
    font-style: normal;
    font-weight: 500;
  }
  .about .body-text {
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--ink-2);
  }
  .principles {
    display: flex;
    flex-direction: column;
    gap: 0;
    border-top: 1px solid var(--rule);
  }
  .principle {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 24px;
    padding: 20px 0;
    border-bottom: 1px solid var(--rule);
    align-items: baseline;
  }
  .principle .num {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink-3);
    letter-spacing: 0.1em;
  }
  .principle .text {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .principle .title {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 19px;
    letter-spacing: -0.025em;
  }
  .principle .desc {
    color: var(--ink-2);
    font-size: 14px;
    line-height: 1.55;
  }

  /* ───────── contact ───────── */
  .contact {
    background: var(--ink);
    color: var(--bg);
    padding: 96px 0;
  }
  .contact h3 {
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(36px, 4.6vw, 60px);
    line-height: 1.04;
    letter-spacing: -0.035em;
    margin: 0 0 32px;
    max-width: 18ch;
  }
  .contact h3 em {
    font-style: normal;
    color: var(--accent);
  }
  .contact .row-c {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 48px;
    flex-wrap: wrap;
  }
  .contact a.mail {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    font-family: var(--sans);
    font-size: 18px;
    border-bottom: 1px solid color-mix(in srgb, var(--bg) 35%, transparent);
    padding-bottom: 6px;
    transition: all 0.18s ease;
  }
  .contact a.mail:hover {
    border-color: var(--accent);
    color: var(--accent);
  }
  .contact .meta {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: color-mix(in srgb, var(--bg) 55%, transparent);
    line-height: 1.7;
  }

  /* ───────── footer ───────── */
  footer.site {
    padding: 28px 0 36px;
    border-top: 1px solid var(--rule-soft);
    background: var(--bg);
  }
  footer.site .row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-3);
  }
  footer.site .row .left { display: flex; gap: 20px; align-items: center; }

  /* responsive */
  @media (max-width: 900px) {
    .container { padding: 0 20px; }
    .hero { padding: 64px 0 56px; }
    .hero .meta-row { grid-template-columns: 1fr 1fr; }
    .section-head { grid-template-columns: 1fr; gap: 20px; }
    .projects { grid-template-columns: 1fr; }
    .project + .project { border-left: 0; border-top: 1px solid var(--rule); }
    .lab-card { grid-template-columns: 1fr; padding: 28px; }
    .about .grid { grid-template-columns: 1fr; gap: 40px; }
    nav.primary { display: none; }
    section.block { padding: 64px 0; }
    .contact { padding: 72px 0; }
  }